Pressure Indicator Transmitters

Pressure indicator transmitters have a digital indicator for providing a local indication of pressure reading, and a 4-20 milliamp output pressure transmitter for sending an analogue signal to control & monitoring instrumentation.

The built-in digital indicators can be scaled via push buttons or adjustment pots to any pressure unit or a 0-100% full scaling.

No additional external supply is required, since the digital indicator is powered by the 4-20mA current loop from the pressure transmitter.

• DS201P High Range Flush Pressure Gauge, Switch and Sensor
• DS200P Sanitary Low Range Pressure Gauge, Switch and Sensor
• LEO3 Current or Digital Output Pressure Gauge
• DS200 Combined Pressure Switch, Gauge and Sensor
• DS210 Combined Low Pressure Switch, Indicator and Sensor
• DS201 Combined Pressure Sensor, Display and Switch

• Truck loading monitoring using air cushion pressure
• Autoclave pressure sensor and display with 10 bar range
• Injection moulding machine 22000 psig 4-20mA output synthetic hydraulic oil pressure sensor
• 500psig 4-20mA freshwater display, switch and pressure sensor for building management use
• 250psig air regulator pressure gauge with 4-20mA output and 1/4 NPT male fitting
• Low vacuum leak detection 4-20mA current loop sensor & gauge

Product Help

Specifying pressure indicator transmitter features

Indicator type

A pressure indicator transmitter includes a built-in pressure gauge for reading in-situ.

Do you require LCD, backlit LCD, or an LED display?

A display can be configured to display the pressure reading in different pressure units, or as a % full scale, the 4-20mA output, alarm levels, and calibration values.

Output signal

Typically a pressure transmitter with a built-in display indicator will have a 4-20mA 2 wire current loop signal. This 4-20mA signal may include intrinsically safe or flameproof certification for hazardous areas, and HART communications for use in a process plant with other HART enabled devices.

Alarm switch

Since there is a built-in display it is possible to add alarm contact switches on some pressure indicator transmitters which are easily configurable via the display and menu keys.

The contact switches are normally a solid state type such as PNP or NPN, which keeps the size and wiring to a minimum.

Re-calibration

Depending on the product type it is possible to re-calibrate the 4-20mA output signal and the display reading by adjusting the zero and span setting via the display panel menu buttons.

Turn-down ratio

Turn-down the output signal to re-scale the measured range. The turndown ratio defines how low the range can be reduced. A ratio of 3:1 or 4:1 is possible with simpler lower cost transmitters, and increases to 10:1 or 100:1 with more expensive intelligent transmitters.

Will the pressure indicating transmitter need to be moved or re-purposed to measure over a different range?

Checklist for pressure indicator transmitter requirements

Define your pressure indicator transmitter requirements using this checklist:

1. Indicator type?
2. Output signal?
3. Alarm switch?
4. Re-calibration?
5. Turn-down ratio?
6. Pressure range?
7. Electrical connection?
8. Process connection?